Price for project like uploadnsell.com

So i am wondering how much it would cost me for someone to make me site that would do the same as uploadnsell.com
Which means people can upload files and then get the link to pay via paypal. Once their buyer buys it they get the download link to the product to their paypal email(IPN)

If you want to make it the professional way then it’s not just a frontpage with a script. You need a complete system where people can register, upload their files, change their settings,...
You need to have a backend where you can administrate everything, check the files, check the payments. Or how is that done? Do you already have such a system running and only want a submission form for your front page? But the ‘logic’ behind that is already build?

Also: Don’t forget: You handle submissions of digital products (ecommerce) which people want to sell on your platform – so you propably should consider a special webhosting environment and a ssl certificate for your domains, a backup solution, probably some licenses (depends on where you life) Not to mention Privacy Policies, Terms of Service,...

So if we take into consideration that you do the most of this stuff by yourself (setting up a server, buying a certificate, writing the terms of service,...) and you only need someone who can design and code the “web app”, where people can register, login, upload files, getting paid,...you should calculate a MINIMUM of 5000$ upwards – for a good and trustworthy person, that’s for sure. I would even go that far to say that if you find someone who do this for less you’ll run into problems, sooner or later.